how to fix the P0303 code on my Honda Accord Eleventh Generation (2023-present)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Disconnect the negative battery terminal to ensure safety.
• Allow the engine to cool down before starting work.

2. Inspect and Replace Spark Plug

• Tools Required: Socket set, torque wrench, gap gauge
• Remove the ignition coil cover if applicable.
• Remove the spark plug using a spark plug socket.
• Inspect the spark plug for signs of wear (e.g., corrosion, carbon buildup).
• If necessary, replace the spark plug with a new one, ensuring it has the correct gap (consult the owner's manual for specifications).
• Reinstall the spark plug and torque it to the manufacturer's specifications (typically around 13-16 lb-ft).

3. Check and Replace Ignition Coil

• Tools Required: Socket set
• Disconnect the electrical connector from the ignition coil.
• Remove the ignition coil from cylinder 3 by unscrewing it.
• Inspect for cracks or damage; replace if necessary.
• Install the new ignition coil and reconnect the electrical connector.

4. Inspect and Replace Fuel Injector

• Tools Required: Fuel line removal tool, socket set
• Relieve fuel pressure by removing the fuel pump fuse and running the engine until it stalls.
• Disconnect the fuel injector connector and the fuel line from the injector.
• Remove the fuel injector from cylinder 3.
• Inspect the injector for clogs; clean or replace if needed.
• Reinstall the fuel injector, reconnect the fuel line and electrical connector.

5. Final Checks

• Reconnect the negative battery terminal.
• Start the engine and check for smooth operation.
• Ensure that the check engine light has turned off.